Multistage centrifugal pump.



m. 89.0;662; PATENTED JUNE 16. 1908.

GLLAGER. MULTISTAGE- GENTRIFUGA-L'PUMP.

APPLICATION FILED MAR. 19, 1907.

'3 SHEETS-SHEET '1.

No. 8,90,662 PATENTED JUNE 16, 1908.

.0. men, 'MULTISTAGE GENTRIPUGAL PUMP.

A'BPLIGATIONII LBD MAR. 19, 1907.

s sums-41mm 2.

No. 890,662. PATENTBDVJUNE 16, 190 0. LAGER.

MULIISTAG'E GENTRIFUGAL PUMR APPLICATION FILED MAR.19, 1907.

3SHEETS-SHEBT a.

oF IcE;

CARL LAGER, F BALDWIN SVILLE, NEW YORK.

MULTISTAGE GENTRIFUGAL PUMP.

To all whom itmay concern:

Be it known thatI, CAR LAGER, of'Baldwinsville, in thecounty ofOnondaga, in the State of New York, have invented new and usefulImprovements in Multistage .Centrifugal Pumps, ofwhich the following,taken in connection with the accompanying drawmgs, is a full, clear, andexact description.

This lnvention relates to certain improvements in multi-stagecentrifugal pumps referring more particularly to the construction of theimpellers and to the inclosing case "in which the impeller chambers areformed.

The essential object of my present invention is to simplify the generalstructure of the pump and at the same time to increase 'its workingefficiency byreducing the number of parts and locatingtjhe diaphragm andwater passages .there'through in a plane at one side of the main body ofthe partition so that the water, ways may be readily milled and cleanedfrom obstructions which might i'nterferewith the free passage of theWater and therebv cause excessive friction.

so Y A further object is to construct the imipellers in such manner; asto automatically counter-balancethem and their driving shait against endthrust and at the same time to a longitudinal vertical sectional viewtaken on line- 2-2, Fig. 1, except that the driving shaft is shown inelevation. Fig. 4 is an end view of one of. the detached intermediatecase sections constituting one of the -parti 'tions which divide theinterior of the casing into compartments. Fig. 5 is a sectional view talien on line 5 Fig. 4. Fig. 6 is an end view of one of the impellers,and 7 is a sectional view taken on line 7-7, Fig; 6. Fig. 8 is anendview of a slightly modified form of impeller and Fig. 9 is asectionalview taken on line 9-9, Fig.4 8.

The casing comprises a suction inlet section -1, a delivery. section 2-and any suitable. number of,' in this instance two,

. Specification of Letters Patent. Application at March 19, 1907. SerialNo. 363.206.

intermediate sections' -3-'a'nd 4, all

Patented June 16, 1908.

.of which areclamped together end to end by suitable clampin bolts '5-'which connect the end sections 1 and -'2- beyond the periphery of theintermediate sections 3 and 4 thereby clamping said intermediatesections end to end to each other and between the end sections 1 and 2Without passing the bolts through the intermediate sections. i

A suction inlet conduit constituting a part of the casing is secured byclamping bolts T to the .inlet side of the adjacent end section '-1 andis rovid'ed with a suction-inlet, 8- adapte to be connected to thesource of water supply while the op osite end section 2 is provided witha de ivorypi e -9- which isusually formed integral with the deliverysection 1 and tangential to its delivery conduit as best seen in Fig.

The inlet section 6- and delivery sec tion '2 are formed with centralalined bearings -10 and- 1'1 respectively in which is journaled asuitable driving shaft- 12- adapted to be driven fromany availablesource of power, not necessary to herein illustrate or describe, saidbearings being provided with wearing sleeves l3- inclosing the adjacentportions of the shaft and adapted to be readily removed when worn' andre placed by new ones and thereby avoiding the replacement of the casesections in which they are supported; The intermediate sec-v tions 3 and4 divide the intervening space between the end sections 1 and --2 into aseries of, in this instance three, impeller chambers and are providedwith central alined openings -14 in which are iittedtubular wearingsleeves or bearings -1 5. for the central portion of the shaft 12 whichcarries a series of, in this in stance three, impellers, 16 '17 and 18each revolving in one of the imneller chambers.

The portion of the shaft upon which the impellers are mounted is reducedin diameter forminga shoulder 20 against which the last impeller of theseries abuts, said impellers being spaced apa rt by thesleeves 15 andare'held against endwisemovement between the shoulder '-20 and suitablelock nuts 21,whi'clr are secured upon the shaft 12 at the inlet sideofithe first im when: the spacing sleeves being .of suflicient ength toprevent undue 'lriction between the impellers and adjacentsides of thepartitions 3." and l-. I

,Tllfi end thrust, due to the action of the imellers upon the water, isalwavs toward the inlet and I, therefore, provide an end thrust. bearingbetween the inlet end of the shaft and a suitable tnljusting screw'saidbcaring being lubricated through .anoil passage '-L l leading'froman oil cup 25 in the top of the casing section 6.

' Water is drawn into the puinp through the suction inlet 8 and througha central -opening'26'- in the casiin ection -1 to the'first runner---16-- which deliver-s it through suitable passages in the partition orcase section to the second runn'er of the series, which inturinldehversit to the next runner and soon through any number of runners, when-- itis'finally discharged from the last one'ofthe series into thedischargecon duitthepressure produced by each succ ire runneror impeller beingincreased 3 at thev pressure produced by the lastrumierfof the. seriesequals that produced by the runner mult n lied by the number of gunners.Q

"fl hevcollectivepressure 'produced by the runners tends to. excessiveend thrust in the direction-ofthe sue-tit 1r inlet butwhich i haveovercome by the hse of a specific form .ofim' "eller by which. thebressure at the front and ack ot eac-h impeller is substantiallythes'ame as will be presently described.

Each of the intermediate case sections +3-..-{ and 4* are substantiallidentical andpre-ferably consists of a pair of circular disks or.diaphragms 3()- and 31 dispnsedsideby side a sufficient distance apartto 'formintervening water passages -32-- arid are united by mtegralvanes -3 3- ditfidin'g the intervening water way into equal fittingannular tongues and grooves which serve not only to lock the sectionsagainst relative radial displacement but also affords more effectivewater-'tight joints. V

The impellers 1'6, +I7'-, and lS- are substantially identical inconstruction, each comprising a central-hub and. a pair of rings -35 ofsomewhat. greater diameter than the hub and connected thereto by vanes36-- as best seen in Figs: 3, fiend 7, said The rings being spaced apartforming intervening delivery s ots or openings 3S of suitable size toobtain the desired capacity of delivery with a nnnn'num' friction.

"The rings --35 are of greater interior diameter than the exteriordiameter of the.

hub of the impeller leaving the intervening space open from end to endor side to side,

the vanes -36 being formed integral with the hub and the rings.-35serving to unite the outer ends of the vanes to give them the desiredstrength and are preferablyjfor'ined integral therewith.

In the smaller sizes of pumps the face width of theperiphery oftheimpellers orcombined face width of the rings 35 and intervening space38. is substan tially equal to the width of the vanes -36- but in thelarger sizes of pumps the outer faces of the sides of the rings as 40-,Figs. 8 and 9., are preferably cut away to reduce the weight althoughthe width of the vanes remains the same to the periphery of theimpeller. The hub of each runner is also provided with a series ofapertures l3'-' extending theret-hrough from front to rear only reducesthe weight of the impeller but also atl'ords additional means forbalancing the water pressure at opposite sides of each runner whichtogether with the openings between the hub and rings pracwhich nottically equalize the pressure at. both sides of the runner therebycounterbalancing the end thrust of the several runners and theirsupporting shaft.

It will be observed upon reference to-Fig. 3 that the contiguous facesof adjacent case sections are .formed with annularrecesses constitutinga runner chamber and that the marginal edge ofthe first and nextsucceedingcase section over-hangs and surrou nls the next adjacent disk3]. and forms therewith a water passage 50 connecting the inclosedimpeller chamber with the water passage between the disks 30 and 31which latter in' turn discharge through the central opening of thediaphragm -30 and into the opening of the adjacent impeller. It will beobserved that. the disk --3l is disposed some distance wholly at oneside of the adjacent face of the disk -3()- leaving a. clear -openingbetween the disks so that a suitable milling or cleaning tool may beinserted radially from the periphery through the passages and betweenthe disks to smooth the sides of the water ways and to remove anyobstructions which may interfere with the free passage of the watertherethrough as it is well known that the efliciency of o eration ofthis class of pumps depends large y upon the smoothness of the sides ofthe water ways, Ano't-her important feature is that thesides andperiphery of the plate or disk 3lmay be milled by ordinary tools and infact all parts of both disks '30- and are easily accessible for truingup in a lathe or by other suitable instruments. Further more it will beobserved thattheonly core required is that to vform the interveningspaces between the disks and between the vanes, which enables the deviceto be readily moldedinany ordinary sand mold.

As best seen in Fig. 5, the diaphragm or disk-30 is provided with anannular flange 60- projecting axially from the side opposite to thatabout'which the disk 31 is secured, a distance'greater than the axialwidth of said disk -3l forming a part of the case inclosingone of theimpeller chambers and also surrounding" the diaphragm'or disk -31 of thenext adjacent partition.

v The operation may be briefly described as follows: ater is drawn inthrough the inlet ''-8 centrally through the inlet 26. o the first casesection '-1 into theflce'ntral opening of the first impeller from whichit is discharged radially into the annular passage -'50 and isthenreturned toward the centerthrough passages 33 between the diaphragm30 and 31 'ofthe next case section -3 being then delivered through thecentral opening in said intermediate case section '3 centrally in thesecond runner and so on through the next annular passage 50 around theperiphery of the diaphragm 3l' of the intermediate sect on 4 and intothethird runner from which 'it is. discharged into the" delivery.conduit 9' 4 During this action of the water, the water pressure atopposite sides of each runner is substantially equalized by the freepassage of the water throughthe open space between the rings 35 and hubof each i111 peller thereby counter-balancing the end said main body topermit cleaning and smoothing ol'the-sides of the water passages.

2. In a centrifugal pump, a case section comprising two disks of unequaldiameters and spaced apart forming a waterway, the smaller disk and aconsiderable portion of the Waterway extending some distance beyond theadjacent side of the larger disk, and vanes uniting said disks.

3. In a multi-stage centrifugal pump, opposlte end and intermediate casesections and K external bolts clamping said sections together, theintermediate sections dividing the interior of the ease into impellercompart- "ments and each comprising two disks ot unequal diameters, thesmaller disk of each intermediate section being spaced apart somedistance from the adjacent end of its larger disk forming an interveningwaterway, vanes uniting said disks across:thewaterway, impellers-1n theimpeller chambers and connected. for serial operation, each impellercomprising a hubandvanes projecting there from, and rings connecting theextreme outer ends of the impeller vanes and spaced apart formingintervening water passages.

In witness whereof I have hereunto set my hand this 9th day of March1907 CARL LAGER. l/Vitnesses: L

H. E. CHA E, MILDRED M. N OTT.

